Orientation, location, and velocity of Saturn's bow shock: Initial results from the Cassini spacecraft - Achilleos, N; Bertucci, C; Russell, CT; Hospodarsky, GB; Rymer, AM; Arridge, CS; Burton, ME; Dougherty, MK; Hendricks, S; Smith, EJ; Tsurutani, BT (JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 2006)